The Castle is the main government building of the British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha, located in Jamestown on the island of Saint Helena. A Grade I-listed building, the oldest parts of the complex date to 1708, but it was largely reconstructed in the 1860s because of termite damage. It does not have the appearance of a typical castle, though historically the site was part of the East India Company fortifications of Jamestown.